Electrical stop motion for looms



May 15,1934. J. LAMBERT ELECTRICAL STOP MOTION FOR LOOMS (707272 Jar/256m Filed July 27, 1935 Patented May 15, 1934 ELECTRICAL STOP MOTION FOR LOOMS John Lambert, Pawtucket, R. I.

Application July 27, 1933, Serial No. 682,496

3 Claims.

This invention relates to certain new and useful improvements in electrical stop motion for looms.

In the operation of a loom, the warp thread passes through the eyes of heddle wires suspended at their ends on a pair of heddle bars in a harness or heddle frame and it frequently occurs that foreign matter adheres to the warp threads, known by weavers as floats which result in the presence of floats in a woven cloth, also what is known as stickers, a tight warp yarn mark and serious damage by action thereof on the shed of the loom, and it is therefore the primary object of this invention to provide an electrical stop motion for looms rendered operative by the presence of foreign matter or floats on the warp thread.

A further object of the invention is to improve the construction of heddle bar to become a de- 21) tector of the presence of such floats on the warp thread with the heddle bar operated under influence of the heddle wires for the operation of electrical devices acting on the stop motion for a loom.

With the above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

I11 the drawing:-

Figure l is a side elevational view, partly broken away and partly shown in section of a heddle bar constructed in accordance with the present invention;

Figure 2 is a side elevational view, similar to Figure 1 showing the resilient section of the heddle bar shifted by a heddle wire into position for operating the electrical stop motion for the loom;

Figure 3 is a fragmentary side elevational view of a part of the heddle bar showing the spring wire associated therewith for normally holding the same in inoperative position;

Figure 4 is a fragmentary side elevational view of the trough part of the heddle bar;

Figure 5 is a cross-sectional view taken on line 5-5 of Figure 1, showing the contact devices of the two-part heddle bar;

Figure 6 is an end elevational view of the resilient section of the heddle bar; and

Figure '7 is an end elevational view of the trough section of the heddle bar.

Referring more in detail to the accompanying drawing, there is illustrated a heddle bar for looms constructed in a manner to set into op"-- eration an electrical stop motion for looms in the presence of foreign matter or floats on the warp thread, the heddle bar designated in general by the reference character 10 comprising a rigid trough-shaped section of U-formation in end elevation, illustrated as having side walls 11 and a bottom wall 12. A channel member 13 is seated on the bottom wall 12 of the trough and has its sides spaced from the side walls 11 of the trough, the channel member 13 being lined with insulation material 14 and upon which insulation material there is received a steel rod 15 insulated from the channel member and trough.

The other section of the heddle bar 10 comprises a resilient rod 16 inclosed by a resilient tube 17 that carries substantially segment-shaped laterally directed fingers 18, each provided with a cross-opening 19 adjacent the tube 17. The resilient section of the heddle bar is maintained in assembled relation with the rigid trough section thereof in any convenient manner and said sections are normally spaced from each other by means of a resilient wire 20 threaded through chosen openings 19 in the segments 18 with the wire 20 formed in the loops 21 and extending on opposite sides of the segments, terminating outwardly thereof for reception in the space between the side walls of the channel member 13 and the side walls 11 of the trough section as shown in Figure 5 for normally spacing the segments 18 from the steel rods 15.

The heddle wires are associated with the heddle bar disclosed herein in the usual manner with the warp thread passing through the eyes of the heddle wires. When a float appears on the warp thread, a strain is exerted on the heddle wire for moving the resilient rod 16 against the tension of the spring loops 21 to the position shown at P in Figure 2, the segment 18 being moved into contact with the steel rod 15 for closing of an electric circuit for the operation of the electrical stop motion for the loom. As soon as tension of the heddle wire is relieved, the resilient section of the heddle bar including the rod 16 and enclosing tube 1'7 returns to its normal position as shown in Figure 1 for spacing the segment 18 from the steel rod 15. The segment 18 and steel rod 15 constitute electrical contacts that permit the flow of electrical current to the magnet on the loom with the magnets operating the electrical stop motion.

While there is herein shown and described the preferred embodiment of the invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

I claim:-

1. Means for operating a warp stop motion for looms comprising a heddle bar and associated heddle wire and said heddle bar being constructed and adapted for closing an electrical circuit by distortion of the heddle wire caused by the presence of a float on the warp thread, the heddle bar including a rigid section and a resilient section normally spaced therefrom, and a serpentine spring element carried by one section with the loops thereof engaged with the other section for holding the sections in their inoperative separated positions and permitting flexure of any part of the resilient sections for the closing of the circuit. .o

2. Means for operating a warp stop motion for looms comprising a heddle bar and associated heddle wire and said heddle bar being constructed and adapted for closing an electrical circuit by distortion of the heddle wire caused by the presence of a float on the warp thread, the heddle bar including a rigid section carrying an electrical contact and a resilient section having a continuous series of contact segments normally spaced from the aforesaid electrical contact, and a serpentine spring element carried by one section with the loops thereof engaged with the other section for holding the sections in their inoperative separated positions and permitting flexure of any part of the resilient sections for the closing of the circuit.

3. Means for operating a warp stop motion for looms comprising a heddle bar and associated heddle wire and said heddle bar being constructed and adapted for closing an electrical circuit by distortion of the heddle wire caused by the presence of a float on the warp thread, the heddle bar including a rigid trough member, an electrical contact rod seated in the trough and insulated therefrom, a resilient rod carrying a series of contact segments extending into the trough member and a spring device carried by the resilient rod and engaged with the trough member to normally space the contact rod from the segments.

JOHN LAMBERT. 

